A cikin wannan takarda, ana nazarin aikin cajin baturi na 40Ah tare da ingantaccen lantarki NCM111+ LMO ta hanyar gwaje-gwaje da kwaikwayo.Matsakaicin cajin wutar lantarki shine 0.33C, 0.5C da 1C, bi da bi.Girman baturi shine 240mm * 150mm * 14mm.(ƙididdige bisa ga ƙimar ƙarfin lantarki na 3.65V, ƙayyadaddun ƙarfinsa na musamman kusan 290Wh/L, wanda har yanzu yana da ƙasa kaɗan)
Ana nuna ƙarfin wutar lantarki, zafin jiki da juriya na ciki yayin aiwatar da cajin sama da ƙasa a cikin Hoto 1. Ana iya rarraba shi kusan zuwa matakai huɗu:
Matakin farko: 1
Mataki na biyu: 1.2
Mataki na uku: 1.4
Mataki na hudu: SOC> 1.6, matsa lamba na ciki na baturi ya wuce iyaka, ruptures na casing, diaphragm yana raguwa kuma ya lalace, da kuma yanayin zafi na baturi.Wani ɗan gajeren kewayawa yana faruwa a cikin baturin, yawan adadin kuzari yana fitowa cikin sauri, kuma zafin baturin yana ƙaruwa sosai zuwa 780°C.
Zafin da aka haifar yayin aikin cajin ya haɗa da: zafi mai jujjuyawar entropy, zafin Joule, zafin amsa sinadarai da zafi da aka fitar ta gajeriyar da'ira ta ciki.Zafin sinadarai ya haɗa da zafin da aka saki ta hanyar rushewar Mn, amsawar lithium na ƙarfe tare da electrolyte, oxidation na electrolyte, bazuwar fim ɗin SEI, bazuwar wutar lantarki mara kyau da bazuwar wutar lantarki mai kyau. (NCM111 da LMO).Tebu 1 yana nuna canjin enthalpy da kuzarin kunnawa na kowane martani.(Wannan labarin yayi watsi da halayen masu ɗaurewa)
Hoto na 3 kwatanci ne na yawan samar da zafi yayin da ake yin caji tare da igiyoyin caji daban-daban.Za a iya yanke shawara mai zuwa daga Hoto3:
1) Yayin da cajin halin yanzu yana ƙaruwa, lokacin gudu na thermal yana ci gaba.
2) Samar da zafi a lokacin cajin yana mamaye zafi na Joule.SOC <1.2, jimlar samar da zafi daidai yake da zafi na Joule.
3) A mataki na biyu (1
4) SOC> 1.45, zafi da aka saki ta hanyar amsawar lithium na karfe da electrolyte zai wuce zafi na Joule.
5) Lokacin da SOC> 1.6, haɓakar haɓakawa tsakanin fim ɗin SEI da wutar lantarki mara kyau ta fara, ƙimar samar da zafi na haɓakar iskar oxygen ta haɓaka haɓakawa sosai, kuma jimlar samar da zafi ya kai ƙimar kololuwa.(Bayyanai na 4 da 5 a cikin wallafe-wallafen sun ɗan yi daidai da hotuna, kuma hotuna a nan za su yi nasara kuma an daidaita su.)
6) A lokacin aikin overcharge, halayen lithium na ƙarfe tare da electrolyte da oxidation na electrolyte sune babban halayen.
Ta hanyar binciken da ke sama, yuwuwar iskar oxygenation na electrolyte, ƙarfin wutar lantarki mara kyau, da zafin farko na runaway thermal sune maɓalli uku masu mahimmanci don yin caji.Hoto na 4 yana nuna tasirin mabuɗin maɓalli guda uku akan aikin caji fiye da kima.Ana iya ganin haɓakar yuwuwar oxidation na electrolyte na iya haɓaka aikin cajin baturi sosai, yayin da ƙarfin wutar lantarki mara kyau yana da ɗan tasiri akan aikin cajin.(A wasu kalmomi, babban ƙarfin lantarki yana taimakawa wajen inganta aikin cajin baturi, kuma ƙara yawan N/P yana da ɗan tasiri akan yawan cajin baturi.)
Nassoshi
D. Ren et al.Jaridar Madogaran Wuta 364 (2017) 328-340
Lokacin aikawa: Dec-15-2022